US12415187B2 - Key grinding pan segment, grinding pan segment system, and method for same - Google Patents

Key grinding pan segment, grinding pan segment system, and method for same

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Publication number
US12415187B2
US12415187B2 US17/996,273 US202017996273A US12415187B2 US 12415187 B2 US12415187 B2 US 12415187B2 US 202017996273 A US202017996273 A US 202017996273A US 12415187 B2 US12415187 B2 US 12415187B2
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United States
Prior art keywords
grinding pan
grinding
segment
key
segments
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Active
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US17/996,273
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English (en)
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US20230191418A1 (en
Inventor
Jörg BETTENWORTH
Michael Keyssner
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Loesche GmbH
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Loesche GmbH
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Assigned to LOESCHE GMBH reassignment LOESCHE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BETTENWORTH, Jörg, KEYSSNER, MICHAEL
Publication of US20230191418A1 publication Critical patent/US20230191418A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/003—Shape or construction of discs or rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2210/00—Codes relating to different types of disintegrating devices
    • B02C2210/02—Features for generally used wear parts on beaters, knives, rollers, anvils, linings and the like

Definitions

  • the invention relates to a key grinding pan segment for a grinding track of a grinding pan of a roller mill.
  • the grinding track has an annular form with an outer circumference and a smaller inner circumference around a center point.
  • the replaceable key grinding pan segment has an outer edge and an inner edge as well as two connection edges connecting the outer and inner edges.
  • the invention relates to a grinding pan segment system for a grinding track of a grinding pan of a roller mill with a plurality of standard grinding pan segments of the same size and shape, each having an inner edge and an outer edge which are connected by two connection edges.
  • the length of the inner edge is shorter here than the length of the outer edge.
  • the invention also relates to a method for removing grinding pan segments from a grinding pan with a grinding pan segment system.
  • Common roller mills have a grinding pan that rotates under the stationary, rotatably mounted grinding rollers.
  • the grinding pan has a grinding track on which the grinding rollers roll.
  • the material to be milled to be comminuted is located between the grinding pan or the grinding track and the grinding rollers.
  • the grinding rollers act by the force of their own weight, but are sometimes also subjected to additional force, so that they press on the grinding track and thus on the grinding pan.
  • wear occurs on the one hand on the grinding rollers and on the other hand also on the grinding track due to the forces that occur and the material abrasion caused by the material to be milled. For this reason, the grinding track is designed to be replaceable in most roller mills.
  • the annular grinding track has exchangeable segments of the same size, which have a form similar to a piece of cake. This means that they are trapezoidal and have a greater length at their outer edge than at their inner edge. Specifically, both the outer edge and the inner edge describe an arc shape, which is due to the annular design of the grinding track. However, it is also possible to design the inner and outer edges straight, so that the grinding track forms a polygonal shape which approximates an annular shape.
  • a grinding pan is often also referred to as a grinding table or grinding plate.
  • the grinding pan segments are also referred to as grinding table plates or plate segments.
  • the grinding pan segments are also often referred to as grinding plates or grinding table plating.
  • the object of the invention is therefore to provide a grinding pan segment, a grinding pan segment system, and a method for replacing grinding pan segments which facilitate the replacement process.
  • a key grinding pan segment system for a grinding track of a grinding pan of a roller mill having multiple grinding pan segments each having an inner edge and an outer edge, which are connected by two connection edges, wherein the length of the inner edge is smaller than the length of the outer edge, having at least one exchangeable key grinding pan segment for the grinding track of the grinding pan of the roller mill, wherein the grinding track has an annular shape with an outer circumference and a smaller inner circumference around the center point, having an outer edge and an inner edge as well as two connection edges connecting the outer and inner edges, wherein the length of the inner edge closer to the center point is greater than the length of the outer edge further away from the center point, and having at least one compensating grinding pan segment which is arranged next to the key grinding pan segment, wherein the length of a circular arc formed by the key grinding pan segment decreases as the radius from the inner edge to the outer edge increases, whereby the shape of the key grinding pan segment is a shape similar to an inverted piece of cake, wherein the grinding
  • the length of the inner edge closer to the center point is greater than the length of the outer edge further from the center point.
  • the invention is based on the basic concept of deviating from the conventional form used until now.
  • the replaceable key grinding pan segment is dimensioned in such a way that, when pushed toward the grinding pan center point, it no longer becomes wedged due to its geometric shape, thus making it possible to remove the key grinding pan segment in this way.
  • Another advantage of this design is also that the gap between the key grinding pan segment and its connection edges to the neighboring grinding pan segments is automatically enlarged or the problems caused by solidified material to be milled are thus minimized or do not occur in this form.
  • the outer edge of the key grinding pan segment forms a circular arc on the outer circumference and the inner edge of the key grinding pan segment forms a circular arc on the inner circumference of the grinding pan.
  • the dimensions of the key grinding pan segment fit the grinding track of the grinding pan, wherein the tip, however, is missing.
  • the length of a circular arc formed by the key grinding pan segment may decrease as the radius increases from the inner edge to the outer edge.
  • the shape of the key grinding pan segment is a shape similar to an inverted piece of cake.
  • a press recess is provided on the outer edge of the key grinding pan segment for placement of a press for the replacement process.
  • a pressing tool can be applied and can press the key grinding pan segment in the direction of the center point of the grinding pan.
  • the pressing tool can be applied here between the press recess and the edge of the main body of the grinding pan.
  • the press recess is formed in such a way that it can be covered by a retention rim component during operation. This means that it is designed in such a way that, if possible, the design prevents material to be milled from being pressed into the press recess.
  • the term “during operation” can be understood to mean roller mill that is ready for use. This means, in particular, that the grinding pan is fully assembled at least on the mill side, i.e. a grinding track with a retention rim is present.
  • the invention further relates to a grinding pan segment system for a grinding track of a grinding pan of a roller mill with a plurality of grinding pan segments, each having an inner edge and an outer edge. The two edges are connected by two connection edges. The length of the inner edges is less than the length of the outer edge.
  • the standard grinding pan segments have a form similar to a piece of cake, but lack the tip.
  • the grinding pan segment system further comprises at least one key grinding pan segment according to the invention and at least one compensating grinding pan segment arranged adjacently to the key grinding pan segment.
  • the grinding pan which is constructed from the grinding pan segment system, or the rolling surface of the rollers can be replaced relatively easily without the need for time-consuming removal and comminution of material from the joints as previously described in the prior art.
  • the grinding pan segments are formed as standard grinding pan segments of the same size and shape, and the key grinding pan segment and the at least one compensating grinding pan segment together form the shape of one or more standard grinding pan segments.
  • Grinding pan segments can also be referred to as grinding plates.
  • two compensating grinding pan segments are provided in an arrangement to the left and right of the key grinding pan segment.
  • the two compensating grinding pan segments can be designed substantially mirror symmetrical with respect to an axis on the radius of the grinding pan through the key grinding pan segment.
  • This axis can, for example, be the axis of symmetry on the radius of the key grinding pan segment.
  • Such a design makes it easy to achieve the size of one or more standard grinding pan segments with one key grinding pan segment and two compensating grinding pan segments. This is further simplified by the provision of mirror-symmetrically constructed compensating grinding pan segments.
  • two compensating grinding pan segments with the key grinding pan segment have the size of one, two or three standard grinding pan segments.
  • the grinding pan segments can also be formed as compensating grinding pan segments.
  • several key grinding pan segments are provided. It is preferred here that an equal number of compensating grinding pan segments and key grinding pan segments are provided. In other words, each key grinding pan segment is followed by a compensating grinding pan segment.
  • standard grinding pan segments as previously described, are no longer used.
  • the compensating grinding pan segments as a combination, as described in the previous embodiment, of standard grinding pan segments with compensating grinding pan segments, provided that they are formed in one piece. In this case, it is merely necessary to have two different grinding pan segment types.
  • Another advantage results from that a plurality of key grinding pan segments are provided, so that it is irrelevant in what position the grinding pan has come to a stop in relation to the grinding rollers arranged above it. Otherwise, care must be taken to ensure that the key grinding pan segment does not come to a stop in the region of a roller, as disassembly would then be complicated and ideally the bowl would have to be turned further.
  • the grinding pan segments i.e. the standard grinding pan segments
  • the key grinding pan segment(s) and/or the compensating grinding pan segments can be fastened to the grinding pan by means of a single-part or multi-part designed clamping ring.
  • the clamping ring abuts against the inner circumference of the grinding track, i.e. against the inner edge of the grinding pan segments, and thus presses the grinding pan segments outward against an edge of the grinding pan base or main body.
  • the invention further relates to a roller mill with a grinding pan, wherein the grinding pan comprises a grinding pan segment system according to the invention.
  • a roller mill of this type has the advantage that when the grinding track, i.e. the individual grinding pan segments, is replaced and newly installed, this can be done much more quickly than with conventional grinding pan segments. This is due to the fact that the key grinding pan segment can be removed from the grinding track very easily and it is hardly necessary to remove the material to be milled that has accumulated at the edge between the key grinding pan segment and the adjacent segments before removing the key grinding pan segment.
  • the invention also relates to a method for removing a grinding pan segment from a grinding track of a grinding pan of a roller mill having a grinding pan segment system according to the invention.
  • a method for removing a grinding pan segment from a grinding track of a grinding pan of a roller mill having a grinding pan segment system according to the invention it is provided that first the clamping ring and the baffle ring are removed from the grinding pan.
  • the press recess of the key grinding pan segment according to the invention is now open.
  • a pressing tool can be applied to the press recess and the key grinding pan segment can be pressed toward the center of the grinding pan.
  • the main body of the grinding pan serves here as a counter bearing.
  • FIG. 1 shows a schematic plan view of a grinding pan with a grinding track according to a first embodiment
  • FIG. 2 shows a schematic plan view of a grinding pan with a grinding track according to a second embodiment
  • FIG. 3 shows a sectional view through a grinding pan with a grinding track.
  • FIG. 1 shows a schematic view of a topview on a grinding pan 4 with a grinding track 5 according to a first embodiment.
  • the grinding track 5 is composed of a key grinding pan segment 10 , two mirror-symmetrically shaped compensating grinding pan segments 11 and ten standard grinding pan segments 12 .
  • the key grinding pan segment 10 has an outer edge 31 , an inner edge 32 and two lateral connection edges 33 .
  • the standard grinding pan segments 12 also have an outer edge 41 , an inner edge 42 and two connection edges 43 .
  • the two compensating grinding pan segments 11 which have an outer edge 51 , an inner edge 52 and two connection edges 53 .
  • the outer edge 31 of the key grinding pan segment 10 according to the invention has a shorter length than its inner edge 32 . This allows the key grinding pan segment 10 to be pushed inward toward the grinding pan center 6 .
  • this offers the advantage that pushing the key grinding pan segment 10 inward increases the free space between the connection edges 33 of the key grinding pan segment 10 and the adjacent connection edges 53 of the compensating grinding pan segment 11 .
  • This also means that material to be milled pressed herein cannot prevent the key grinding pan segment from being pushed inward.
  • the key grinding pan segment 10 is the size of two normal standard grinding pan segments 12 . This means that standard elements can be used for the rest of the grinding track.
  • FIG. 2 shows an alternative embodiment of the grinding pan 5 .
  • the grinding pan 5 according to this embodiment has, by way of example, six key grinding pan segments 10 and, by way of example, six compensating grinding pan segments 11 . These are respectively arranged alternately on the grinding pan 5 .
  • the standard grinding pan segments 12 are omitted here.
  • only two different types of grinding pan segments are used. This simplifies stock-keeping.
  • Another advantage of this embodiment is that the first key grinding pan segment 10 , which is removed by pushing it inward toward the grinding pan center 6 , can be freely selected.
  • FIG. 3 shows a sectional view through a grinding pan 4 .
  • a press recess 15 is shown in the right-hand region of the key grinding pan segment 10 .
  • This is covered by a retention rim 26 .
  • the position of the retention rim 26 ensures that hardly any or at least only very little material to be milled enters the press recess 15 during operation, i.e. during the grinding processes.
  • the key grinding pan segment 10 itself is arranged and secured in an indentation in the grinding pan body 7 by means of a clamping ring 20 .
  • the key grinding pan segment 10 is inserted in this case, then the clamping ring 20 is attached. This is fastened by means of a screw 21 . Due to its wedge shape, the clamping ring presses the key grinding pan segment 10 against the outer edge of the grinding pan when the screw 21 is tightened.
  • the other grinding pan segments 11 , 12 are fastened in a similar way before or after this.
  • this process is carried out in reverse order.
  • the key grinding pan segment 10 is removed first before the other grinding pan segments 11 , 12 .
  • the screw 21 is loosened first, so that the clamping ring 20 can be removed.
  • the baffle ring 26 is also removed.
  • a pressing tool can be inserted into the press recess 15 and thus the key grinding pan segment 10 can be pressed into the space in which the clamping ring 20 was previously located.
  • the other grinding pan segments 11 , 12 can also be removed relatively easily.
  • the grinding pan segment system according to the invention as well as the method according to the invention, it is possible to significantly simplify the replacement of grinding pan segments of a grinding track of a roller mill and to perform this within a shorter time.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Adjustment And Processing Of Grains (AREA)
US17/996,273 2020-04-16 2020-04-16 Key grinding pan segment, grinding pan segment system, and method for same Active US12415187B2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2020/060674 WO2021209133A1 (de) 2020-04-16 2020-04-16 Schlüssel-mahltellersegment, mahltellersegmentsystem und verfahren hierzu

Publications (2)

Publication Number Publication Date
US20230191418A1 US20230191418A1 (en) 2023-06-22
US12415187B2 true US12415187B2 (en) 2025-09-16

Family

ID=70333937

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Application Number Title Priority Date Filing Date
US17/996,273 Active US12415187B2 (en) 2020-04-16 2020-04-16 Key grinding pan segment, grinding pan segment system, and method for same

Country Status (10)

Country Link
US (1) US12415187B2 (da)
EP (1) EP4135901B1 (da)
JP (1) JP7427807B2 (da)
CN (1) CN115515716B (da)
AU (1) AU2020442474B2 (da)
DK (1) DK4135901T3 (da)
ES (1) ES2990186T3 (da)
MX (1) MX2022012993A (da)
WO (1) WO2021209133A1 (da)
ZA (1) ZA202211068B (da)

Citations (21)

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Publication number Priority date Publication date Assignee Title
US347232A (en) * 1886-08-10 Grin-ding-mill
US412568A (en) * 1889-10-08 Vaughn
US1110222A (en) * 1910-11-18 1914-09-08 Jacques Morat Grinding machinery.
US2689689A (en) * 1950-10-09 1954-09-21 Max Berz Grinding apparatus
GB761696A (en) 1954-05-11 1956-11-21 Bernard Mann Improvements relating to crushing or grinding mills
US3061208A (en) * 1958-07-15 1962-10-30 Schauer Siegfried Crushing mill
US3138337A (en) * 1963-03-26 1964-06-23 Combustion Eng Pulverizing bowl mill utlizing a segmented bull ring
GB1114923A (en) * 1964-07-01 1968-05-22 P H I Engineering Ltd Improvements in and relating to ring or turntable roller pulverising mills
US3409236A (en) * 1965-12-21 1968-11-05 Combustion Eng Segmented grinding roll assembly
DE1507629A1 (de) 1966-12-28 1969-04-10 Pfeiffer Barbarossawerke Mahlplatte fuer Walzenquetschmuehlen
US3782646A (en) * 1971-05-18 1974-01-01 H Brundiek Roller mill of the edge runner type
DE8204278U1 (de) 1982-02-16 1982-06-24 Gebr. Pfeiffer Ag, 6750 Kaiserslautern Mahlschuessel fuer walzenmuehlen
US4382558A (en) * 1979-03-19 1983-05-10 F. L. Smidth & Co. Roller mill
DE3415072A1 (de) * 1984-04-21 1985-10-24 Deutsche Babcock Werke AG, 4200 Oberhausen Schuesselmuehle
US4600157A (en) * 1983-12-07 1986-07-15 Deutsche Babcock Werke Aktiengesellschaft Bowl mill
US20090011913A1 (en) * 2007-07-02 2009-01-08 Babcock Power Inc. Tire for material treatment system
US20110114769A1 (en) * 2009-11-19 2011-05-19 Wark Rickey E Double course vane wheel
CN203018137U (zh) 2012-12-27 2013-06-26 中材（天津）粉体技术装备有限公司 一种立磨磨盘衬板防滑装置
US20170361328A1 (en) * 2016-06-21 2017-12-21 General Electric Technology Gmbh System, method and apparatus for upgrading a pulverizer
CN110773277A (zh) 2019-11-29 2020-02-11 安徽同创电力科技有限公司 一种组合式金属陶瓷复合一体化磨煤机动静环及制备方法
CN211070290U (zh) 2019-11-27 2020-07-24 昌群精细工业（宜昌）有限公司 一种用于立式磨机的磨盘

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US3366338A (en) * 1965-12-07 1968-01-30 Foster Wheeler Corp Segment-type grinding ring
DE1507580A1 (de) 1966-05-20 1969-04-03 Loesche Kg Verschleissteil,insbesondere Mahlringsegment fuer Waelzmuehlen,Walzenmuehlen,Federrollenmuehlen u.dgl.
JPS59184946U (ja) * 1983-05-24 1984-12-08 石川島播磨重工業株式会社 竪型ミルのテ−ブルライナの固定装置
FR2615409B1 (fr) 1987-05-22 1991-11-08 Magotteaux Sa Piece d'usure composite pour broyeurs verticaux
JPH01163440U (da) * 1988-04-27 1989-11-14
CN110354957B (zh) 2019-08-21 2024-08-09 上海卡山科技股份有限公司 一种hp中速磨煤机磨碗装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US347232A (en) * 1886-08-10 Grin-ding-mill
US412568A (en) * 1889-10-08 Vaughn
US1110222A (en) * 1910-11-18 1914-09-08 Jacques Morat Grinding machinery.
US2689689A (en) * 1950-10-09 1954-09-21 Max Berz Grinding apparatus
GB761696A (en) 1954-05-11 1956-11-21 Bernard Mann Improvements relating to crushing or grinding mills
US3061208A (en) * 1958-07-15 1962-10-30 Schauer Siegfried Crushing mill
US3138337A (en) * 1963-03-26 1964-06-23 Combustion Eng Pulverizing bowl mill utlizing a segmented bull ring
GB1114923A (en) * 1964-07-01 1968-05-22 P H I Engineering Ltd Improvements in and relating to ring or turntable roller pulverising mills
US3409236A (en) * 1965-12-21 1968-11-05 Combustion Eng Segmented grinding roll assembly
DE1507629A1 (de) 1966-12-28 1969-04-10 Pfeiffer Barbarossawerke Mahlplatte fuer Walzenquetschmuehlen
US3782646A (en) * 1971-05-18 1974-01-01 H Brundiek Roller mill of the edge runner type
US4382558A (en) * 1979-03-19 1983-05-10 F. L. Smidth & Co. Roller mill
DE8204278U1 (de) 1982-02-16 1982-06-24 Gebr. Pfeiffer Ag, 6750 Kaiserslautern Mahlschuessel fuer walzenmuehlen
US4600157A (en) * 1983-12-07 1986-07-15 Deutsche Babcock Werke Aktiengesellschaft Bowl mill
DE3415072A1 (de) * 1984-04-21 1985-10-24 Deutsche Babcock Werke AG, 4200 Oberhausen Schuesselmuehle
US20090011913A1 (en) * 2007-07-02 2009-01-08 Babcock Power Inc. Tire for material treatment system
US20110114769A1 (en) * 2009-11-19 2011-05-19 Wark Rickey E Double course vane wheel
CN203018137U (zh) 2012-12-27 2013-06-26 中材（天津）粉体技术装备有限公司 一种立磨磨盘衬板防滑装置
US20170361328A1 (en) * 2016-06-21 2017-12-21 General Electric Technology Gmbh System, method and apparatus for upgrading a pulverizer
CN211070290U (zh) 2019-11-27 2020-07-24 昌群精细工业（宜昌）有限公司 一种用于立式磨机的磨盘
CN110773277A (zh) 2019-11-29 2020-02-11 安徽同创电力科技有限公司 一种组合式金属陶瓷复合一体化磨煤机动静环及制备方法

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Chinese First Office Action & Search Report dated May 23, 2023, relating to CN Patent Application No. 202080099816.8.

Also Published As

Publication number Publication date
MX2022012993A (es) 2022-12-08
JP7427807B2 (ja) 2024-02-05
ES2990186T3 (es) 2024-11-29
AU2020442474A1 (en) 2022-11-03
EP4135901A1 (de) 2023-02-22
JP2023529059A (ja) 2023-07-07
WO2021209133A1 (de) 2021-10-21
US20230191418A1 (en) 2023-06-22
ZA202211068B (en) 2023-05-31
BR112022020930A2 (pt) 2022-12-27
DK4135901T3 (da) 2024-08-19
CN115515716B (zh) 2023-12-26
EP4135901B1 (de) 2024-05-29
AU2020442474B2 (en) 2024-02-15
CN115515716A (zh) 2022-12-23

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